In the study , six different ecotype varieties of common wheat and f1 derived from 6 6 complete diallel crossing system were selected for the research on the characteristics and heterosis of spike differentiation . the results showed that heterosis existed in most key spike differentiation phases and varied with different ecotype varieties . heterosis of spike differentiation was positively correlated with heterosis of hybrid yield . finally , the author concluded that it was the best way to produce strong heterosis combination by selecting the mode of “ spring wheat winter wheat ” in huanghuai winter wheat region 对6个不同生态类型小麦品种及其完全双列杂交f1幼穗分化特点和穗分化杂种优势的研究表明,杂种幼穗分化各主要时期普遍存在杂种优势；不同生态类型组配方式的杂种穗分化优势不同；穗分化杂种优势与产量杂种优势具有一定相关关系；黄淮麦区杂交小麦最佳生态组配方式为春性品种冬性品种。
Yaxin underwear fittings factory is a private enterprise specializing in specializing in the fittings of bust of the underwear , the position is located in the yanbu town with title of the production base in china ; produce and include mainly : the bust is carried and deducted , the stainless steel is enclosed , the glue steel rim of nylon bag , nylon bag glue enclose eight product of spiking etc . , and offer the speciality to dye the service . . . . . . 佛山市南海区盐步雅鑫内衣配件厂是一家以专业生产内衣胸围配件为主的私营企业，位置座落于具有中国内生产基地之称的盐步镇主要生产包括：胸围背扣，不锈钢圈，尼包胶钢圈，尼包胶圈捌扣等产品，并且提供专业染色服务.
The study on the characteristics of development and seed setting of different spikelet and floret positions was important for the realization of big - spike - cultural - goal with more spikelets and grains . with both the winter type ( wv ) and spring type ( sv ) varieties sown at different dates , it was found that the greater seed setting capacity of spikelets resulted in more grain number of spike . the trend of differences in grain weight per spikelet between the different sowing dates and varieties was similar to that of grain number . the correlation between the average grain weight of middle spikelets and lower spikelets and the grain weight per spike was highly significant . the environmental changes resulted from different sowing dates mainly effected the middle spikelets development , even though the differences between wv and sv were represented in every spikelet positions . the grain weight on the second floret position was most sensitive to the development status of wheat plant and environmental changes , and could represent the yielid potential of the whole spikelet . the results showed that the enhancement of seed setting of the middle spikelets ( from 5th to 15th ) and the grain development from the first to third floret positions was a key to realize big - spike and grain 确定小麦不同小穗位和小花位发育与结实特性是实现大穗多粒的重要前提.本文通过对冬、春性小麦品种分期播种试验得出,较高的小穗结实力是增加穗粒数的重要因素.不同播期、品种之间,小穗粒重和粒数呈现相同的变化趋势.中部以及基部小穗粒重与穗粒重之间呈高度正相关.体现环境差异的播期效应以对中部小穗发育的影响为主,而冬、春性品种的基因型差异可反映在各个小穗位上.第2小花位的子粒发育状况反映整个小穗的生产能力.结果表明,促进中部优势小穗(第5 15小穗)结实和第1 3小花位子粒发育是提高小花结实率和穗粒重的关键
